Free Z-Score Calculator
Calculate how many standard deviations a value lies from the mean.
Z-Score Calculator
Enter a value to begin.
How to use this z-score calculator
- Enter a value, population mean and positive standard deviation.
- Check the inputs and preview, then use the primary action.
- Download, copy or use the result shown by the tool.
How the result is calculated
Z-score subtracts the mean from the observation and divides by standard deviation.
All calculation and transformation work happens in this browser tab. No entered value is sent to an Noler Tools application server.
Important limitations
Results are provided for convenience and should be checked independently before an important decision. A format or checksum result never authenticates an identity, document, account, licence, vehicle or registration.
Frequently asked questions
Is this z-score calculator free?
Yes. It is free to use and does not require an account.
Does Noler Tools save my input?
No. The input and result remain in temporary browser memory and are not uploaded or saved by this site.